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@@ -0,0 +1,36 @@
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+public class Codec {
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+ private int id = 0;
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+ private HashMap<Integer, String> map = new HashMap<>();
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+
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+ // Encodes a URL to a shortened URL.
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+ public String encode(String longUrl) {
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+ String[] strs = longUrl.split("//");
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+ map.put(id, strs[0] + "/");
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+ StringBuilder sb = new StringBuilder();
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+ sb.append(id++);
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+ String[] body = strs[1].split("/", -1); // -1 means do not discard the last "" string
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+ for (String s : body) {
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+ map.put(id, s);
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+ sb.append(',');
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+ sb.append(id++);
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+ }
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+ return sb.toString();
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+ }
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+
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+ // Decodes a shortened URL to its original URL.
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+ public String decode(String shortUrl) {
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+ String[] code = shortUrl.split(",");
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+ LinkedList<String> list = new LinkedList<>();
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+ for (String c : code) {
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+ int id = Integer.parseInt(c);
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+ String s = map.get(id);
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+ list.add(s);
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+ }
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+ String[] strs = list.toArray(new String[list.size()]);
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+ return String.join("/", strs);
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+ }
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+}
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+
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+// Your Codec object will be instantiated and called as such:
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+// Codec codec = new Codec();
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+// codec.decode(codec.encode(url));
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